EP0334533A3 - Fibre optic discrete or continuous liquid level sensor - Google Patents

Fibre optic discrete or continuous liquid level sensor Download PDF

Info

Publication number
EP0334533A3
EP0334533A3 EP89302507A EP89302507A EP0334533A3 EP 0334533 A3 EP0334533 A3 EP 0334533A3 EP 89302507 A EP89302507 A EP 89302507A EP 89302507 A EP89302507 A EP 89302507A EP 0334533 A3 EP0334533 A3 EP 0334533A3
Authority
EP
European Patent Office
Prior art keywords
discrete
liquid level
level sensor
fibre optic
continuous liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89302507A
Other versions
EP0334533B1 (en
EP0334533A2 (en
Inventor
James W. Snow
Paul D. Colbourne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IMO Industries Inc
Original Assignee
FOCAL TECHNOLOGIES Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/168,481 external-priority patent/US4870292A/en
Priority claimed from US07/292,111 external-priority patent/US4942306A/en
Application filed by FOCAL TECHNOLOGIES Inc filed Critical FOCAL TECHNOLOGIES Inc
Publication of EP0334533A2 publication Critical patent/EP0334533A2/en
Publication of EP0334533A3 publication Critical patent/EP0334533A3/en
Application granted granted Critical
Publication of EP0334533B1 publication Critical patent/EP0334533B1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
    • G01F23/2925—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms using electrical detecting means
    • G01F23/2927—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms using electrical detecting means for several discrete levels, e.g. with more than one light-conducting sensing element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
    • G01F23/2925—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms using electrical detecting means

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
EP19890302507 1988-03-15 1989-03-14 Fibre optic discrete or continuous liquid level sensor Expired EP0334533B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US292111 1981-08-12
US168481 1988-03-15
US07/168,481 US4870292A (en) 1988-03-15 1988-03-15 Fibre optic sensor for liquid level and other parameters
US07/292,111 US4942306A (en) 1988-12-30 1988-12-30 Fibre optic sensor for the continuous measurement liquids level and other parameters

Publications (3)

Publication Number Publication Date
EP0334533A2 EP0334533A2 (en) 1989-09-27
EP0334533A3 true EP0334533A3 (en) 1989-11-29
EP0334533B1 EP0334533B1 (en) 1992-10-14

Family

ID=26864162

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890302507 Expired EP0334533B1 (en) 1988-03-15 1989-03-14 Fibre optic discrete or continuous liquid level sensor

Country Status (3)

Country Link
EP (1) EP0334533B1 (en)
CA (1) CA1332205C (en)
DE (1) DE68903183T2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK66992D0 (en) * 1992-05-21 1992-05-21 Faxe Kalkbrud Aktieselskabet SENSOR
US5330073A (en) * 1993-04-15 1994-07-19 Boston Advanced Technologies, Inc. Gasoline dispenser leak detectors and automatic shut-off systems
US5422495A (en) * 1993-04-15 1995-06-06 Boston Advanced Technologies, Inc. Optical sensor having a floatation means for detecting fluids through refractive index measurement
GB9513975D0 (en) * 1995-07-08 1995-09-06 Hussmann Europ Ltd Monitoring system for a liquid level control
CA2271918A1 (en) * 1999-05-11 2000-11-11 Lee A. Danisch Transversely coupled fiber optic sensor for measuring and classifying contact and shape
FI116421B (en) * 2001-09-12 2005-11-15 Matti Kari Level switch
US6949758B2 (en) 2001-10-19 2005-09-27 Visteon Global Technologies, Inc. LCC-based fluid-level detection sensor
GB2385664B (en) * 2001-10-19 2004-03-10 Visteon Global Tech Inc LCC-Based strain-gage sensor integrated with cylinder-head gasket
US8136690B2 (en) 2009-04-14 2012-03-20 Microsoft Corporation Sensing the amount of liquid in a vessel
DE102014223280A1 (en) * 2014-06-17 2015-12-17 Robert Bosch Gmbh level sensor
US9645004B2 (en) * 2014-11-19 2017-05-09 The Boeing Company Optical impedance modulation for fuel quantity measurement comprising a fiber encased by a tube having a longitudinal slot with a lens
US10175087B2 (en) 2017-02-09 2019-01-08 The Boeing Company Fuel level sensor having dual fluorescent plastic optical fibers
US10371559B2 (en) 2017-04-17 2019-08-06 The Boeing Company Differential spectral liquid level sensor
US10352755B2 (en) 2017-04-17 2019-07-16 The Boeing Company Passive differential liquid level sensor using optical fibers
US10935413B2 (en) 2019-04-10 2021-03-02 The Boeing Company Non-contact time-of-flight fuel level sensor using plastic optical fiber
RU2757976C1 (en) * 2020-07-14 2021-10-25 Александр Владимирович Репин Fibre-optic liquid level indicator
CN113463061A (en) * 2021-06-24 2021-10-01 中国科学院合肥物质科学研究院 Processing method of light spot sampling optical fiber

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403826A (en) * 1981-03-23 1983-09-13 Bell Telephone Laboratories, Incorporated Ultraviolet radiation detector
US4440022A (en) * 1981-10-14 1984-04-03 Smiths Industries Public Limited Company Liquid-level detection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403826A (en) * 1981-03-23 1983-09-13 Bell Telephone Laboratories, Incorporated Ultraviolet radiation detector
US4440022A (en) * 1981-10-14 1984-04-03 Smiths Industries Public Limited Company Liquid-level detection

Also Published As

Publication number Publication date
DE68903183T2 (en) 1993-03-18
EP0334533B1 (en) 1992-10-14
DE68903183D1 (en) 1992-11-19
CA1332205C (en) 1994-10-04
EP0334533A2 (en) 1989-09-27

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